VBoxManage setextradata global GUI/MaxGuestResolution anywill remove all limits on guest resolutions.VBoxManage setextradata global GUI/MaxGuestResolution >width,height<manually speciﬁes a maximum resolution.VBoxManage setextradata global GUI/MaxGuestResolution autorestores the default settings. Note that these settings apply globally to all guest systems, not just to a single machine.
Wednesday, November 20, 2013
Sometimes a virtual pc in VirtualBox will refuse to take up the whole screen. Even in Full-Screen mode, it will insist on showing things in a 1024x768 resolution. To fix this, you need to open a command prompt and run one of the following from c:\Program Files\Oracle\VirtualBox . This was taken from section 9.8.2 of the VirtualBox manual